High Voltage Oil Immersed Three Phase Distribution Transformer for Power Supply

• Application: Power, Electronic
• Phase: Three
• Core: Core-type Transformer
• Cooling Method: Oil-immersed Type Transformer
• Winding Type: Two-winding Transformer
• Certification: ISO9001-2000
• Model NO.: S7, S9, S11
• Usage: Power Transformer
• Frequency Characteristics: Power Frequency
• Shape of Core: Ring
• Brand: Rockwell
• Color: Gray, Green or Customized
• Type 1: Oil-Immersed Type
• Type 2: Pad Mounted Type Transformer
• Type 3: Pole Mounted Type Transformer
• Type 4: Dry Type Transformer
• Transport Package: Wooden Packing
• Specification: IEC/ANSI/IEEE/BS/GB
• Trademark: Rockwell
• Origin: China
• HS Code: 8504231100
• Production Capacity: 20000

Product Description

High Voltage Oil immersed Three Phase distribution  Transformer for Power Supply

Distribution Transformer

1. Capacity: 10 up to 3150kVA
2. High Voltage: 3.3kV up to 33kV
4. Connection Method: Optional

Exporting to oversea with very successful experience. 

Rated capacity kVA	Voltage combination				NO-load loss W	Load loss W	No-load current %	Short-circuit Impedance
	HV (KV )	HV tapping range	LV (KV)	Connection symbol
30	6.3kV 10.5kV 11kV 13.2kV 13.8kV 15kV	±2 × 2.5%;  Or ±5%	0.4	Dyn11 or Yyn0	90	660	2.1	5.5
50					130	960	2.0
63					150	1145	1.9
80					180	1370	1.8
100					200	1650	1.6
125					240	1980	1.5
160					290	2420	1.4
200					330	2860	1.3
250					400	3350	1.2
315					480	4010	1.1
400					570	4730	1.0
500					680	5660	1.0
630					810	6820	0.9	6
800					980	8250	0.8
1000					1150	11330	0.7
1250					1350	13200	0.7
1600					1630	15950	0.6
2000					1950	19140	0.6
2500					2340	22200	0.6

 

Types of Distribution Transformer

 

Oil-immersed Type

Generally, this transformer is available in different sizes with efficiencies along with insulating oil. The selection of this transformer mainly lies in the requirement and budget of the user. There are four types of distribution transformer connections available like star-star, delta-delta, star-delta, delta-star and Zig Zag/delta zigzag.

 

Mainly Components:

The mainly parts of this transformer include Oil Tank, Conservator, Buchholz Relay, Breather Unit, Oil Indicator, Temperature Detector, Pressure Relief Device, Thermal Relay, Radiator, and Bushing.

1. The oil tank is used to soak the windings by placing it in.
2. A conservator is arranged above the oil tank at the outside of the transformer frame. It is connected to the main tank with the help of a metallic tube. The oil within the tank can 3. be easily contacted & enlarge throughout loading so that the temperature of the oil can be increased and decrease.
4. Buchholz relay is used when a conservator tank is used. Because it indicates errors like loss of oil once it goes low, improper flow of oil between the tank & transformer.
5. Breather Unit includes silica gel that absorbs moisture in the oil. It changes its color from blue color to pink color it is not capable to absorb moisture in the oil.
6. The oil indicator indicates the level of the oil within the conservatory unit.
7. The temperature detector monitors the temperature of the oil. If the temperature of the oil increases to a certain level then the transformer will be disconnected from the service.
8. Pressure relief device decreases the pressure within the transformer to avoid an explosion of the transformer.
9. Thermal relay is used as an indicator for the temperature of the winding
10. The radiator is used to increase the transformer's cooling efficiency.
11. The bushing is used to connect the internal windings of the transformer with the help of an exterior electrical network.

 

Pad Mounted Type

Pad mounted transformer is a ground mounted electric power distribution transformer in a locked steel cabinet mounted on a concrete pad. Since all energized connection points are securely enclosed in a grounded metal housing, a pad mounted transformer can be installed in places that do not have room for a fenced enclosure.

The Pad-mount transformer is oil filled unit. The core and coils are enclosed in a steel oil-filled tank, with terminals for the transformer accessible in an adjacent lockable wiring cabinet. The wiring cabinet has high and low voltage wiring compartments. High and low voltage underground cables from below enter the terminal compartments directly. The top of the tank has a cover secured with carriage bolt-nut assemblies. The wiring cabinet has sidewalls on two ends with doors that open sideways to expose the high and low voltage wiring compartments.

 

 

Dry Type

Dry-type transformers, also known as cast resin transformers, the windings and core are kept within a sealed tank that is pressurized with air. These transformers simplify installation since they are dry, without cooling oil, and so require no fire-proof vault for indoor installations. The epoxy protects the windings from dust and corrosive atmospheres.

 

 

Pole Mounted Type

Pole mounted transformers are electric utility distribution transformers that are mounted on an electrical service pole and are usually at the level of the overhead cables. These are used for changing high distribution voltage to low like 120/240-volt power. These types of transformers are used in a wide rural area, ranges from 16 kVA to 100kVA. These are available in small size and easy to fit on single-pole structures. These transformers are reliable to harsh climates when they used in remote areas.